| Skopelos | Portland | OR |
| Skyros | Portland | OR |
| S M Babcock | Portland | OR |
| Smith Builder | Portland | OR |
| Smith Victory | Portland | OR |
| Smith Voyager | Portland | OR |
| Smoky Hill | Portland | OR |
| Smurfit-Stone Container | Newberg | OR |
| Sothern Eagle | Portland | OR |
| South Africa Victory | Portland | OR |
| South Bend Victory | Portland | OR |
| Southern Oregon College | Ashland | OR |
| Southern Oregon Wood | Grants Pass | OR |
| Southern Pacific | Klamath Falls | OR |
| Southhampton | Portland | OR |
| South Park Hall | Portland | OR |
| Sovetskaya Gavan | Portland | OR |
| Spalding Building | Portland | OR |
| Spaulding Pulp & Paper | Portland | OR |
| Spaulding Pulp & Paper | Newberg | OR |
| Sp Newsprint | Newberg | OR |
| Spokane Portland & Seattle Railway | Portland | OR |
| Springfield Lumber Divisiion | Springfield | OR |
| Springfield Utility | Springfield | OR |
| Spruce Production Division Plant | Toledo | OR |
| Stafford Elementary School | West Linn | OR |
| Standard Insurance Building | Portland | OR |
| Standard Plaza Building | Portland | OR |
| Stanford Newel | Portland | OR |
| Stanvac Bombay | Portland | OR |
| Stanvac Brisbane | Portland | OR |
| Stanvac Durban | Portland | OR |
| Stanvac Hong Kong | Portland | OR |
| Stanvac Singapore | Portland | OR |
| State Agricultural Building | Salem | OR |
| State Capitol | Salem | OR |
| State Capitol Heating Plant | Salem | OR |
| State Office Building | Salem | OR |
| Stayton Canning | Stayton | OR |
| Steam Laundries | Portland | OR |
| Steam Tanker Northfield | Portland | OR |
| Stearns Roger | Gardiner | OR |
| Steens Mountain | Portland | OR |
| Stepan Razin | Portland | OR |
| Stephen A. Douglas | Portland | OR |
| Stephen G. Porter | Portland | OR |
| Steropr | Portland | OR |
| Stevens Building | Portland | OR |
| Stimson Lumber | Forest Grove | OR |
| Stones River | Portland | OR |
